.middle > div {
    border: 1px solid red;
}

.middle > div > div {
    padding: 10px;
}

.callus {
    border-top: 1px solid red;
    display: flex;
    flex-direction: column-reverse;
}

.callus > div:nth-child(1) {
    text-align: center;
}

/*让div左右居中*/
.callus > div:nth-child(1) > div:nth-child(1) {
    display: flex;
    justify-content: center;
}

/*让div上下居中*/
.callus > div:nth-child(1) > div:nth-child(1) > div {
    display: flex;
    align-items: center;
}

cc {
    color: orange;
    font-size: 20px;
    /*line-height: 50px;*/
}

bb {
    color: gray;
    font-size: 10px;
    /*line-height:50px;*/
}

.callus > div:nth-child(1) > div:nth-child(2) {
    font-size: 8px;
}

.container {
    width: 100%;
    height: 400px;
    overflow: hidden;
    margin: 0;
    font-family: "微软雅黑";
}